I was told today that I won't be regularized and that this is my last week in the Office

Hello, just asking lang po if this is grounds for filing a dispute in DOLE

First of all, I was a contractual employee for 5 months. Then I was told that I will undergo regularization, but I still had to undergo a probationary period for another 6 months.

I'm already at the 5th month pero I was suddenly suspended for 7 days due to tardiness (Yes, I have to admit that this is true).

I just came back to the office this week, and just after 2 days of coming back (Tuesday). I was told that I won't be regularized anymore and that I only have until Friday in the office.

My concern is that can the company really give me a notice then within the week na agad ang last day ko? Shouldn't it be at least 1 month man lang before ang last day ko. I want to file a case to DOLE but I'm not sure on what grounds. Can I file for Illegal dismissal kaya?

Ang toxic ng company na ito and I doubt that the HR will do anything unless magfile ako ng case. Thanks po sa sasagot.